WO2018120949A1 - Valve prosthesis - Google Patents

Abstract

A valve prosthesis (10), comprising a stent (1), a leaflet (2), and a skirt (3); the stent (1) comprises an inflow end, an outflow end, and a plurality of wavy segments axially connected; the wavy segments comprise a plurality of reticular structure units disposed circumferentially; the leaflet (2) and the skirt (3) are fixed on the stent (1) respectively; the upper portion of the skirt (3) is provided with indentations (321); the skirt (3) is fixed with the leaflet (2) by means of the indentations (321); the skirt (3) further comprises first protrusion portions (323) extending toward the direction of the outflow end of the stent; one ends of the first protrusion portions (323) are connected with the indentations(321), and the other ends of the first protrusion portions are fixed to the stent (1); by such a way, the connection strength of the skirt (3) and the stent (1) is enhanced; and besides, when the valve prosthesis (10) is implanted at a lower position, perivalvular leakage preventing height can be increased by means of the first protrusion portions (323), thereby avoiding the leakage of a part of blood from the stent (1) and further improving the perivalvular leakage preventing effect.

Description

Valve prosthesis Technical field

The present invention relates to the field of medical device technology, and in particular to a valve prosthesis.

Background technique

With the prolongation of human life and the aging of the population, the incidence of valvular disease is getting higher and higher. According to foreign data, between 2% and 7% of people aged over 65 have valvular disease, and in Europe and the United States, after coronary heart disease and hypertension, they rank third. Thousands of patients benefit from surgical valve prosthesis every year, but even in developed countries, there are still a large number of patients with severe valvular disease who are unacceptable because of advanced disease, advanced age, and multiple comorbidities. Surgical treatment, the emergence of transcatheter valve prosthesis products and the continuous improvement of product performance have undoubtedly brought the gospel to these patients and provided an effective treatment.

Studies have shown that this new technology is safe and effective for patients who are at high risk of surgical or surgical valve replacement. Compared with surgery, transcatheter valve replacement does not require thoracotomy and extracorporeal circulation support. It is a treatment method with less trauma, less complications, quick postoperative recovery, and less painful and acceptable patient.

Valve products have been continuously updated and improved, and several products have been used in clinical applications. However, current transcatheter valve prosthesis products still have some drawbacks and are not reasonable enough.

Summary of the invention

It is an object of the present invention to provide a valve prosthesis to reduce problems such as paravalvular leaks and thrombus present after valve implantation.

To achieve the above object, the present invention provides a valve prosthesis comprising a stent, a leaflet and a skirt; wherein the stent comprises an inflow end, an outflow end, and a plurality of axially connected bands, the band comprising a circumference a plurality of mesh structural units arranged; the leaflets and the skirt are respectively fixed to the On the bracket;

The upper portion of the skirt is provided with a notch, the skirt is fixed to the leaflet through the notch, and the skirt further includes a first protrusion extending toward the outflow end of the bracket, the first One end of the protrusion is connected to the notch, and the other end is connected to the bracket.

Preferably, the other end of the first protrusion is located at 1/2 to 2/3 of the height of the leaflet.

Preferably, the number of the first protrusions does not exceed the number of mesh structural units that are fixed to the band in which the stent is located.

Preferably, the number of the first protrusions is 1-9.

Preferably, the upper portion of the skirt is provided with a plurality of the notches, each of the notches being fixed with one piece of the leaflets, and the number of the first protrusions in one of the notches is not more than three.

Preferably, the first protrusion is in a zigzag shape, a trapezoidal shape or a sinusoidal shape.

Preferably, the skirt further includes a second protrusion, one end of which is connected to a lower portion of the skirt, and the other end is fixed to an inflow end of the bracket.

Preferably, the second protrusion is toothed, trapezoidal or sinusoidal.

Preferably, the number of the second protrusions does not exceed the number of the net-like structural units in the circumferential direction at the inflow end of the bracket.

Preferably, the number of the second protrusions is 3 to 12.

Preferably, the skirt is composed of at least one skirt unit having an upper edge and a lower edge, the notch being disposed at an upper edge of the skirt unit, the boundary of the notch comprising a leaflet Fixed edge.

Preferably, the shape of the fixed edge of the leaflet includes a concave curved structure that is convex toward the lower edge.

Preferably, the skirt further comprises a tumbling structure disposed outside the bracket.

Preferably, the skirt is composed of at least one skirt unit having an upper edge and a lower edge, the notch being disposed at an upper edge of the skirt unit, the boundary of the notch comprising a leaflet a fixed side, the skirt unit including a body and an inflow end from the body toward the bracket Extending the formed crease portion, the tumbling portion forms the tumbling structure, and a lower edge of the skirt unit forms an edge of the hem portion.

Preferably, the skirt further comprises a second protrusion, one end of the second protrusion is connected to the edge of the crease portion, and the other end is fixed to the bracket outside the bracket.

Preferably, the other end of the second protrusion is fixed to the mesh structure unit in the first row of wavelength bands from the inflow end of the bracket.

Preferably, the length of the body of the skirt unit is 1.5 to 2 times the length of the tumbling portion.

Preferably, the side edges of the skirt unit are connected to each other to form a splicing line, and the splicing line of the staking portion comprises a straight line extending outward of the bracket or a curve convex toward the outside of the bracket.

Preferably, the notch comprises two sub-notches, respectively located at an upper edge of an adjacent side of an adjacent skirt unit or an upper edge of a left and right side of a skirt unit.

Preferably, the boundary of the sub-notch includes a sub-lobed fixed edge, and the sub-lobed fixed edge includes a concave curved structure that protrudes toward a lower edge of the skirt unit.

Preferably, the adjacent lobes are fixed at the same radius of curvature at the abutment.

Preferably, the length ratio of the adjacent side of the auxiliary leaflets is 1:3 to 3:1.

Preferably, the first protrusion is located in a sub-notch, and the first protrusion is in a zigzag shape, a trapezoidal shape, a sine wave shape, a right triangle shape or a right angle trapezoid.

In summary, in the valve prosthesis of the present invention, a first protrusion is further disposed at an upper portion of the skirt, and the first protrusion extends toward the outflow end of the bracket and is fixed to the bracket, so that the skirt is enhanced on the one hand. The strength of the connection between the side and the stent, on the other hand, when the implantation position of the valve prosthesis is low, the height of the anti-valve leakage can be increased by the first protrusion, thereby avoiding leakage of part of the blood flow from the stent, thereby improving the leakage of the valve. Effect.

In particular, the other end of the first protrusion is located at 1/2 to 2/3 of the height of the leaflet, thus ensuring that the valve prosthesis can work normally and reduce the increase in the height of the flap leakage. The amount of material used in the skirt can also reduce the risk of thrombosis.

DRAWINGS

1 is a schematic structural view of a valve prosthesis in an expanded state according to a first embodiment of the present invention;

2 is a schematic structural view showing a combination of a skirt and a leaflet according to Embodiment 1 of the present invention;

3 is a schematic structural view of a skirt unit according to Embodiment 1 of the present invention;

Figure 4 is a schematic view showing the deployed state of the valve prosthesis according to the second embodiment of the present invention;

Figure 5 is a schematic view showing the valve prosthesis of the second embodiment of the present invention disposed in the aorta;

Figure 6 is a schematic structural view of a skirt unit according to a second embodiment of the present invention;

Figure 7 is a structural schematic view showing the combination of the skirt and the leaflets according to the second embodiment of the present invention;

Figure 8 is a schematic structural view of a skirt unit according to a third embodiment of the present invention;

Fig. 9 is a structural schematic view showing the combination of a skirt and a leaflet in a preferred embodiment of the third embodiment of the present invention.

The reference numerals are as follows:

10-valve prosthesis; 1-stent; 2-valve; 3-skirt; 31, 31'-skirt unit; 311-body; 312-flap portion;

32, 32'-the upper edge of the skirt; 321 - notch; 321a - the first sub-notch: 321b - the second sub-gap: 322, 322' - the fixed edge of the leaflet; 322a - the first sub-lobed fixed edge; 322b - second sub-valve fixed edge; 33, 33' - lower edge of skirt; 34 - splicing line; 35 - extended side; 323, 323a, 323b - first protrusion; 331 - second protrusion; Boundary line; 20-valve.

detailed description

In order to make the objects, advantages and features of the present invention more apparent, the valve prosthesis of the present invention will be further described in detail below with reference to Figures 1-8. It should be noted that the drawings are in a very simplified form and all use non-precise proportions, and are only for convenience and clarity to assist the purpose of the embodiments of the present invention.

As used herein, "proximal, lower or lower" and "distal, upper or upper" are viewed from the direction of blood flow through the valvular prosthesis, although "proximal", "lower" or "lower" and " Remote" "Upper" or "upper end" is not limiting, but "proximal", "lower" or "lower" generally refers to the end of the blood flowing into the valve prosthesis, and the "distal", "upper" or "upper end" Usually refers to the end of the blood vessel that exits the valve prosthesis.

The singular forms "a", "the", and "the" The term "or" is used in the meaning of "and/or" as used in the specification and the appended claims unless the context clearly indicates otherwise. In addition, "inner" or "inside" or "inside" refers to the side of the stent that is away from human tissue, and "outer" or "outer" or "outer" refers to the side of the stent that is adjacent to human tissue.

In addition, the valve prosthesis of the present invention is specifically an interventional prosthetic heart valve prosthesis for replacing a diseased valve, but is not limited thereto. The valve prosthesis of the present invention is described in further detail below in conjunction with specific embodiments.

<Example 1>

1 is a schematic structural view of a valve prosthesis according to a first embodiment of the present invention. FIG. 2 is a schematic structural view of a skirt and a leaflet according to a first embodiment of the present invention, and FIG. 3 is a schematic view of the present invention. A schematic structural view of a skirt unit of the first embodiment.

As shown in FIGS. 1-3, the valve prosthesis 10 includes a stent 1, a leaflet 2, and a skirt 3. In the present invention, the bracket 1 includes an inflow end and an outflow end, and the direction from the inflow end to the outflow end is the axial direction of the bracket 1. The leaflets 2 are at least three pieces, and the leaflets 2 are sequentially connected and fixed to the stent 1. The upper portion of the skirt 3 is provided with a notch 321 , and the skirt 3 is fixed to the leaflet 2 via a notch 321 . The skirt 3 further includes a first protrusion 323 extending toward the outflow end of the bracket 1 . One end of the protruding portion 323 is connected to the notch 321 and the other end is fixed to the bracket 1. Wherein, the outflow end corresponds to a direction in which blood flow flows out, and the inflow end corresponds to a direction in which blood flow flows in.

In the present invention, the bracket 1 further includes a plurality of axially coupled bands, wherein each of the bands includes a plurality of network members arranged circumferentially, the mesh units being composed of a plurality of poles end to end. Those skilled in the art can select the appropriate number of bands according to the needs, and select the mesh of each band. The shape, size, and density of the structural unit, as well as the width and size of the pole. The invention fixes the first protruding portion 323 with the bracket 1 , increases the strength of the connection of the skirt 3 to the bracket 1 , and on the basis of ensuring the connection strength, when the implantation position of the valve prosthesis 10 is low, the first protrusion is passed. The portion 323 can also increase the height of the anti-valve leak and improve the effect of the anti-valve leak. Obviously, the first protrusion 323 and the skirt 3 can be separately produced.

Further, as shown in FIG. 2, the skirt 3 is composed of at least one skirt unit 31, and at this time, the notch 321 is provided at the upper edge 32 of the skirt unit 31. In general, the leaflets 2 and the skirt 3 are fixedly connected by a notch 321. However, the number of the notches 321 is not necessarily related to the number of the skirt units 31 constituting the skirt 3, and one skirt unit 31 may be provided with a plurality of notches 321, or one skirt unit 31 may not be provided with a notch. Further, the boundary of the gap 321 includes a leaflet fixed edge 322 to correspond to the leaflet 2 (shown in Figure 1). The shape of the leaflet fixed edge 322 includes a concave curved structure that is convex toward the lower edge 33 of the skirt unit 31, preferably an arcuate structure, such as a centrally symmetrical arc, preferably the shape of the fixed edge 322 of the leaflet The leaflets 2 match.

In the present embodiment, the skirt 3 is made by sequentially connecting three skirt units 31. In this embodiment, the leaflets 2 are three pieces. In the three skirt units 31, the skirt unit 31 has oppositely disposed upper and lower edges 32, 33 which are located on the upper edge 32 of the skirt unit 31. Further, the boundary of the notch 321 is a leaflet fixed edge 322 to correspond to the leaflet 2 (shown in Figure 2).

In one exemplary operation, the leaflets 2 and the skirt 3 are first sewn together and then mounted together in the expandable stent 1 to form the valve prosthesis 10. The boundary between the skirt 3 and the bracket 1 is along the upper edge 32 and the lower edge 33 of the skirt unit 31, so that the fixing between the skirt 3 and the bracket 1 is achieved.

In addition, the stitching boundary when the two opposite sides of one skirt unit 31 are spliced is the splicing line 34 (the splicing line 34 is not actually a suture for stitching). In this embodiment, the opposite sides of the skirt unit 31 are further provided with an extended edge 35 (shown in FIG. 3), which facilitates the connection between adjacent skirt units 31 and forms a splicing line 34. . The splicing line 34 is a straight line or a non-linear line, specifically It is set according to the side profile of the bracket 1. With such a setting, the skirt 3 can be attached to the bracket 1 during assembly.

In a preferred embodiment, the other end of the first protrusion 323 is located at 1/2 to 2/3 of the height of the leaflet 2 (more clearly shown in FIG. 1), such an arrangement increases the leakage height of the flap On the one hand, on the one hand, it ensures that the valve prosthesis can work normally, on the other hand, the skirt material is reduced, and on the other hand, the risk of thrombosis can be reduced. It should be noted that the height of the leaflet 2 refers to the lower edge of the leaflet 2 (ie, the junction with the notch 321) fixed to the stent 1 from the upper edge of the leaflet 2 (ie, the end near the outflow end of the stent 1). The maximum linear distance along the axial direction of the stent 1. Correspondingly, the other end of the first protrusion 323 refers to an end of the first protrusion 323 fixed behind the bracket near the outflow end of the bracket 1.

Further, the present invention is not particularly limited in shape of the first protruding portion 323 as long as the first protruding portion 323 covers at least a part of the mesh structural unit of the stent 1. Preferably, the first protruding portion 323 has a zigzag shape, a trapezoidal shape, a sinusoidal shape, a similar shape thereof, or the like. When stitching, the first protrusion 323 is sewn to at least two opposing poles constituting the mesh unit to fix the first protrusion 323 to the bracket 1.

Further, the number of the first protruding portions 323 is set according to the number of mesh structural units that are fixed on the wavelength band of the bracket 1. In one embodiment, the number of the first protrusions 323 matches or is less than the number of mesh structural units on the band. Preferably, the number of the first protrusions 323 in the skirt 3 is 1 to 9, and more preferably, the first protrusions 323 are uniformly arranged circumferentially. Preferably, the number of the first protruding portions 323 in one of the notches 321 is not more than three, and more preferably two to three.

In another embodiment, the skirt 3 further includes a second protrusion 331 having one end connected to the lower portion of the skirt 3 and the other end fixed to the inflow end of the bracket 1. Specifically, as shown in FIGS. 1 and 3, the second protruding portion 331 is disposed at a lower edge 33 of the skirt unit 31, and the second protruding portion 331 extends toward the inflow end of the bracket 1 and flows into the bracket 1 The end is fixed. The shape of the second protrusion 331 is not particularly limited, and is preferably in a zigzag shape, a trapezoidal shape, a sinusoidal shape, or the like. Preferably, the number of the second protrusions 331 is according to the inflow end of the bracket 1 The number of circumferentially oriented grid-like structural units is set. In one embodiment, the number of the second protrusions 331 matches the number of the mesh structure units or is smaller than the number of the mesh structure units, preferably 3 to 12.

In the present embodiment, the leaflet 2 and the skirt 3, the skirt 3 and the stent 1, the leaflet 2 and the stent 1, the leaflet 2 and the leaflet 2, and the skirt unit 31 and the skirt unit 31 The fixation is fixed by suture stitching, and the suture is more preferably a medical suture made of a polymer material. However, the manner of fixing in the present invention is not limited to the manner of using a suture, and other means such as glue bonding may also be employed. The present invention is not particularly limited in the manner in which the first protruding portion and the skirt unit are connected. For example, the first protruding portion and the skirt unit may be separately prepared, and then joined by sewing or the like, or the first protruding portion and the skirt unit may be integrally formed. Similarly, the manner in which the second protrusion is connected to the skirt unit is not particularly limited, and may be a fixed connection or an integral molding.

<Embodiment 2>

Similar to the first embodiment, referring to FIG. 4 to FIG. 7, FIG. 4 is a schematic view showing the deployed state of the valve prosthesis according to the second embodiment of the present invention, and FIG. 5 is a schematic view showing the valve prosthesis according to the second embodiment of the present invention disposed in the aorta. Fig. 6 is a schematic structural view of a skirt unit according to a second embodiment of the present invention, and Fig. 7 is a structural schematic view showing a combination of a skirt and a leaflet according to a second embodiment of the present invention. Elements that are identical to the first embodiment or elements that perform the same functions in this embodiment are given the same reference numerals.

As shown in FIGS. 4 to 7, the skirt 3 is formed by splicing three skirt units 31. A notch 321 is defined in the upper edge 32 of each of the skirt units 31. The boundary of each notch 321 is a leaflet fixed edge 322 and corresponds to a leaflet 2, that is, each of the skirt units 31 is fixed by the leaflet fixing edge 322. Connect a leaflet 2. Further, the two first protruding portions 323 are located in a notch 321, and the first protruding portion 323 extends toward the outflow end of the bracket 1 and is fixed to the bracket 1.

Compared with the first embodiment, in the present embodiment, the skirt 3 further includes a tumbling structure disposed outside the bracket 1. As shown in FIG. 6, the skirt unit 31 includes, in addition to the body 311, a tumbling portion 312 extending from the body 311 toward the inflow end of the bracket 1, and the hem portion 312 forms a The sew structure is described. Specifically, the lower end of the body 311 is connected to the upper end of the grooving portion 312 (in FIGS. 6 and 7 , the boundary line I is taken as an example to show the boundary between the body 311 and the staking portion 312, but the boundary line I should be recognized. For the dummy structure, which is merely for convenience of explanation, the lower edge 33 of the skirt unit 31 is located at the lower end of the tumbling portion 312, and the hem portion 312 is fixed to the bracket 1 by the lower edge 33. The staking portion 312 may be integrally formed with the body 311 or may be separately assembled with the body 311, and is not limited thereto. Referring to FIG. 5, when the valve prosthesis 10 is implanted into a human body, the tumbling structure can fill a gap between the stent 1 and the human tissue to overcome the deformation of the stent 1 and the annulus caused by the deformation of the stent 1 after deployment. A leak problem between 20.

Preferably, the length of the body 311 of the skirt unit 31 is 1.5 to 2 times the length of the flap portion 312. If the tumbling portion 312 is too short, it cannot be sutured to the designated position, and the inflow end portion of the bracket 1 may puncture the skirt 3; if the staking portion 312 is too long, it may cause a fluffy effect. Too much material, increasing the overall contour of the product as a whole. The length of the body 311 of the skirt unit 31 refers to the linear distance from the upper edge 32 of the skirt unit 31 to the lower end of the body 311 (ie, the boundary line I), and the hem portion 312 The length refers to the linear distance from the upper end of the tumbling portion 312 (i.e., at the boundary line I) to the lower edge 33 of the skirt unit 31.

In the state of use, as shown in FIGS. 4 and 5, the tumbling portion 312 is folded from the inflow end of the bracket 1 toward the outflow end of the bracket 1 and fixed to the outer circumference of the bracket 1. Preferably, the splicing line of the hem portion 312 includes a straight line extending outward of the bracket or a curve convex toward the outside of the bracket. Thus, the suture portion 312 is formed into a fluffy state by suturing, and the paravalvular leakage can be more effectively prevented. That is, after the stent 1, the skirt 3 and the leaflets 2 are sewn together, the crease structure of the skirt 3 does not abut against the outer surface of the stent 1 but leaves a certain gap therebetween.

Further, the skirt includes a second protrusion 331 extending from a lower edge of the hem 312 (ie, a lower edge 33 of the skirt unit 31) for The outer side of the bracket 1 is fixed. That is, one end of the second protruding portion 331 is connected to the lower edge 33 of the skirt unit 31, and the other end is fixed to the outer side of the bracket 1. The second protruding portion 331 has a zigzag shape, a trapezoidal shape, a sinusoidal shape or a similar shape thereof, and such an outer shape design is more convenient to be fixed to the bracket 1. In a In one embodiment, the second protrusion 331 is sewn to the mesh structure unit fixed on the band of the bracket 1 , such as the mesh structure unit in the first row of the band from the inflow end of the bracket 1 . (It can also be fixed to other positions of the bracket 1 depending on the actual situation). The fixed connection with the first row of bands increases the connection strength based on the increased height of the anti-valve leakage, which reduces the material and reduces the risk of thrombosis compared to some embodiments such as suturing to the second row of bands. .

Similar to the first protruding portion 323, the number of the second protruding portions 331 is set in accordance with the number of mesh structural units to which the bracket 1 is fixed. In one embodiment, the number of the second protrusions 331 matches or is less than the number of mesh structural units on the band in which they are located. In some embodiments, the number of the second protrusions 331 is 3-12. The second protrusions 331 are preferably evenly arranged outside the bracket 1 .

<Example 3>

Elements that are identical to the first embodiment or elements that perform the same functions in this embodiment are given the same reference numerals. The differences between this embodiment and the first embodiment will be mainly described below.

In this embodiment, the skirt 3 is still an annular structure and is formed by splicing three skirt units 31. The skirt 3 is provided with three notches to correspond to three leaflets 2, each of which is provided at the notch. There are two first protrusions. Compared with the second embodiment, the notch includes two sub-notches, which are a first sub-notch 321a and a second sub-notch 321b, respectively, which are respectively placed on the upper edge of the adjacent side of the adjacent skirt unit, that is, For a skirt having a plurality of skirt units, wherein a part of the notch is composed of two sub-notches, and the two sub-notches are respectively located on two adjacent skirt units; or for a skirt unit only For the skirt, the first sub-notch 321a and the second sub-notch 321b are respectively located at the upper edges of the left and right sides of the skirt unit. The first protrusion is located at the sub-notch, and a first protrusion is disposed at each sub-notch.

As shown in Fig. 8, the skirt unit 31' includes an upper edge 32' and a lower edge 33', wherein the first sub-notch 321a is placed on the left side of the upper edge 32' of the skirt unit 31' for use with the left The second sub-notch 321b on the adjacent skirt unit 31' constitutes a complete notch; the second sub-notch 321b is arranged on the skirt The right side of the upper edge 32' of the unit 31' is configured to form a complete notch with the first sub-notch 321a on the right adjacent skirt unit 31'; preferably the first sub-notch 321a and the second sub-notch 321b Symmetrical arrangement. The first sub-gap 321a is provided with a first sub-lobed fixed edge 322a, and the second sub-notch 321b is provided with a second sub-lobed fixed edge 322b. As further shown in FIG. 9, the first sub-notch 321a on the skirt unit 31' and the second sub-notch 321b on the left adjacent skirt unit 31' form a complete notch 321 ', the skirt unit The first sub-lobed fixed edge 322a on 31' and the second sub-lobed fixed edge 322b on the left adjacent skirt unit 31' form a complete leaflet fixed edge 322'. Thus, the two skirt units 31' are fixedly coupled to a leaflet 2. The first sub-gap 321a on the remaining skirt unit 31' and the second sub-gap 321b on the adjacent skirt unit 31' are also arranged as such. In the embodiment shown in FIG. 9, each of the skirt units 31' is provided with a first sub-notch 321a and a second sub-notch 321b. Those skilled in the art should understand that the skirt unit 31' may also be provided only. One of the first sub-gap 321a and the second sub-gap 321b, or no sub-gap. Furthermore, the number of sub-notches included in the entire skirt 3 should be a double number and set in pairs.

In this embodiment, the sub-lobed fixed edge includes a concave curved structure that is convex toward the lower edge of the skirt unit, preferably an arc-shaped structure, and more preferably a circular arc structure. In order to make the split leaflet fixed edge 322' a smooth curve, it is preferred that the radius of curvature of the joint of the fixed leaflet is equal. Of course, the leaflet fixed edge 322' may also have other shapes, and the invention is not particularly limited.

With continued reference to Figure 8, the skirt 3 further includes two first projections 323a and 323b. The first protruding portion 323a is located on the first sub-notch 321a and extends toward the outflow end of the bracket 1 and is fixed to the bracket 1. Similarly, the first protrusion 323b is located on the second sub-notch 321b and also extends for fixing to the bracket 1. The first protrusions 323a and 323b extend toward the outflow end of the stent 1 and are fixed to the stent 1, such as a suture connection (see FIGS. 4 and 5 for the state after the connection). Preferably, the first protrusions 323a and 323b are symmetrically arranged. The invention fixes the first protrusion with the bracket 1 , increases the strength of the connection of the skirt 3 to the bracket 1 , and on the basis of ensuring the connection strength, when the implantation position of the valve prosthesis 10 is low, the first protrusion is passed. It is also possible to increase the height of the anti-valve leak, thereby preventing part of the blood flow from leaking from the stent 1 and improving the effect of preventing the valve leakage.

Further, in the embodiment, the first protruding portion may have a shape such as a right-angled triangle or a right-angled trapezoid, in addition to a zigzag shape, a trapezoidal shape, or a sinusoidal shape. Thus, after the two skirt units 31' are sewn, the first protrusion 323a of one of the skirt units 31' and the first protrusion 323b of the other skirt unit 31' may form a zigzag protrusion or a trapezoidal shape. unit.

Similar to the above embodiment, the two adjacent skirt units 31' are spliced by stitching or the like, and the stitching limit when stitching each other is the splicing line 34, and the two ends of the splicing line 34 are respectively fixed by the adjacent two sub-lobes. The junction of the sides and the lower edge of the skirt unit. Preferably, the length ratio of the adjacent sub-lobe fixed edge is 1:3 to 3:1. For example, the length ratio of the first sub-lobed fixed edge 322a to the second sub-lobed fixed edge 322b may be 1:3. 1:2, 1:1, 2:1, 3:1 or other suitable ratio. The splicing line 34 is a straight line in this embodiment, and one end of the straight line intersects the adjacent two leaflet fixed sides 322a, 322b, and the other end intersects perpendicularly to the lower edge of the skirt unit. At this time, the stitching line 34 is located at a shorter path between the fixed leaf edge 322' and the lower edge 33' of the skirt unit 31', so that the number of stitches to be stitched when stitching the stitching thread is also minimized, thereby reducing the stitching time. The risk of coming to improve the safety of use. However, the shape of the splicing line 34 is not particularly limited in the present invention, and may be a curved or other irregularly shaped structure.

In Fig. 9, the leaflet fixed edge 322' is a centrally symmetrical arc (i.e., the first sub-lobed fixed edge 322a of the skirt unit 31' coincides with the second sub-lobed fixed edge 322b' of the skirt unit 31'. At this point, the intersection of the splicing line 34 and the leaflet fixed edge 322', the first sub-lobed fixed edge 322a and the second sub-lobed fixed edge 322b' joint coincide with each other, and located at the leaflet fixed edge 322' (by The first sub-lobed fixed edge 322a and the second sub-lobed fixed edge 322b' are formed at one-half, and thus here is also the closest to the lower edge 33' of the skirt 3 on the fixed-edge 322' of the leaflet position. When the two adjacent skirt units 31' are sewn here, the stitching line 34 formed is the shortest and the stitching holes are the least.

In summary, in the valve prosthesis of the present invention, a first protrusion is further disposed at an upper portion of the skirt and the leaflet, and the first protrusion extends toward the outflow end of the bracket and is fixed to the bracket, such that one The aspect enhances the strength of the connection between the skirt and the bracket. On the other hand, when the valve prosthesis is implanted at a low position, the height of the paravalvular leakage can be increased by the first protrusion, thereby preventing part of the blood flow from leaking from the stent. And improve the effect of anti-valve leakage.

In particular, the other end of the first protrusion is located at 1/2 to 2/3 of the height of the leaflet, so that the valve prosthesis can be operated normally and the number of the valve prosthesis is increased. The material of the skirt reduces the risk of thrombosis.

The above description is only for the description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes and modifications made by those skilled in the art in light of the above disclosure are all within the scope of the appended claims.

Claims (23)

A valve prosthesis comprising a stent, a leaflet and a skirt, wherein The bracket includes an inflow end, an outflow end, and a plurality of axially connected bands, the wave band including a plurality of mesh structural units arranged circumferentially; the leaflets and the skirt are respectively fixed on the bracket ; The upper portion of the skirt is provided with a notch, the skirt is fixed to the leaflet through the notch, and the skirt further includes a first protrusion extending toward the outflow end of the bracket, the first One end of the protrusion is connected to the notch, and the other end is fixed to the bracket. The valve prosthesis of claim 1 wherein the other end of the first projection is located at 1/2 to 2/3 of the height of the leaflet. The valve prosthesis of claim 1 wherein the number of said first projections does not exceed the number of mesh structural units that are secured to the band in which the stent is located. The valve prosthesis according to claim 3, wherein the number of the first protrusions is 1 to 9. A valve prosthesis according to claim 3, wherein said upper portion of said skirt is provided with a plurality of said notches, each of said notches being fixed to a piece of said leaflets, the first of said one of said notches The number of protrusions does not exceed three. The valve prosthesis of claim 1 wherein said first projection is serrated, trapezoidal or sinusoidal. The valve prosthesis of claim 1 wherein said skirt further comprises a second projection, one end of said second projection being coupled to a lower portion of said skirt and the other end being associated with said bracket The inflow end is fixed. The valve prosthesis of claim 7, wherein the second projection is toothed, trapezoidal or sinusoidal. A valve prosthesis according to claim 7 wherein the number of said second projections The number of the net-like structural units in the circumferential direction at the inflow end of the bracket is not exceeded. The valve prosthesis according to claim 9, wherein the number of the second projections is 3 to 12. The valve prosthesis of claim 1 wherein said skirt is comprised of at least one skirt unit having an upper edge and a lower edge, said notch being disposed in said skirt unit The upper edge, the boundary of the notch includes a fixed edge of the leaflet. The valve prosthesis of claim 11 wherein the shape of the fixed edge of the leaflet comprises a concave curved structure that projects toward the lower edge. The valve prosthesis of claim 1 wherein the skirt further comprises a gusseted structure disposed outside the stent. A valve prosthesis according to claim 13 wherein said skirt is comprised of at least one skirt unit having an upper edge and a lower edge, said notch being disposed in said skirt unit The upper edge, the boundary of the notch includes a fixed edge of the leaflet, the skirt unit includes a body and a tumbling portion extending from the body toward the inflow end of the bracket, the tumbling portion forming the A tumbling structure, and a lower edge of the skirt unit forms an edge of the hem. The valvular prosthesis of claim 14 wherein said skirt further comprises a second projection, one end of said second projection being coupled to the edge of said creping portion and the other end being external to the stent The bracket is fixed. The valve prosthesis of claim 15 wherein the other end of the second projection is secured to the mesh unit in the first row of bands from the inflow end of the stent. The valve prosthesis according to claim 14, wherein the length of the body of the skirt unit is 1.5 to 2 times the length of the tumbling portion. The valve prosthesis according to claim 14, wherein the side edges of the skirt unit are connected to each other to form a splicing line, and the splicing line of the staking portion comprises a straight line extending outward of the bracket or convex toward the outside of the bracket. The curve that starts. The valve prosthesis of claim 11 wherein said gap comprises two sub- The notches are respectively located at an upper edge of an adjacent side of the adjacent skirt unit or an upper edge of the left and right sides of a skirt unit. A valve prosthesis according to claim 19, wherein the boundary of the sub-notch comprises a sub-lobed fixed edge, the sub-lobed fixed edge comprising a projection in the direction of the lower edge of the skirt unit Concave curve structure. A valve prosthesis according to claim 19, wherein the adjacent sub-lobes have a fixed radius of curvature equal to the abutment. The valve prosthesis of claim 19, wherein the length ratio of the adjacent sides of the adjacent leaflets is 1:3 to 3:1. A valve prosthesis according to claim 19, wherein said first projection is located in a sub-notch, said first projection being serrated, trapezoidal, sinusoidal, right-angled or right-angled.

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